Nagano is 1.01× the size of Trentino-Alto Adige

Nagano (prefecture of Japan) covers about 13,700 km² (5,290 mi²) and Trentino-Alto Adige (region of Italy) about 13,500 km² (5,220 mi²). Below, both outlines are drawn at one scale and centred on each other.

13,700km²Nagano
13,500km²Trentino-Alto Adige

50 km

Nagano
Trentino-Alto Adige

What fits

Trentino-Alto Adige is 99% of the size of Nagano.
Nagano is larger by 179 km² (69.2 mi²), which is 1.3% of the area of Trentino-Alto Adige.
Measured in Belgiums: Nagano is about 0.45, Trentino-Alto Adige about 0.44.

How they differ

Nagano also has the larger population: 2.0 million against 1.1 million, 1.89× as many people.
Per square kilometre that is 148 in Nagano against 79 in Trentino-Alto Adige: Nagano is 1.86× as densely populated.
Their centres are about 9,410 km apart.
On a standard web map Trentino-Alto Adige looks larger than Nagano: Nagano at 36°N is drawn about 1.5× too large and Trentino-Alto Adige at 46°N about 2.1×, so the map shows Trentino-Alto Adige as 1.36× the size of Nagano, when Nagano is 1.01× the size of Trentino-Alto Adige.
Together Nagano and Trentino-Alto Adige cover 27,200 km², close to the size of Solomon Islands (27,200 km², 0.1% smaller).
The gap between them, 179 km², is about the size of Aruba (170 km²).
At Trentino-Alto Adige's density, Nagano would have 1.1 million people (it has 2.0 million). At Nagano's density, Trentino-Alto Adige would have 2.0 million (it has 1.1 million).
Trentino-Alto Adige's centre is 10.3° of latitude, about 1,150 km, farther north than Nagano's.
Nagano is the 4th largest of the 47 prefectures of Japan and covers 3.7% of its area; it is the 38th most densely populated of them.
Trentino-Alto Adige is the 11th largest of the 20 regions of Italy and covers 4.5% of its area; it is the 16th most densely populated of them.
Trentino-Alto Adige lies about 10° of latitude (roughly 1,150 km) north of Nagano.
Shared out evenly, each person in Nagano would have about 6,770 m² and each person in Trentino-Alto Adige about 12,610 m².
Laid side by side, Nagano and Trentino-Alto Adige would cover 27,200 km², about the same size as the Solomon Islands.
Together they have 3.1 million people, 1.06× as many people as Armenia.

Side by side

	Nagano	Trentino-Alto Adige
Is a	PrefectureJapan	RegionItaly
Area, measured	13,700 km²5,290 mi²	13,500 km²5,220 mi²
Official area	13,600 km²Wikidata	13,600 km²Wikidata
Rank by area	4th of 47in Japan	11th of 20in Italy
Population	2.0 millionWikidata, 2021	1.1 millionWikidata, 2019
Rank by population	16th of 47in Japan	16th of 20in Italy
Density	148 per km²	79 per km²
Capital	Nagano	Trento
Latitude range	35°N to 37°N	46°N to 47°N

Population: Wikidata 2021 and Wikidata 2019. Official figures: Wikidata (CC0).

Wikidata's official figure of 13,600 km² agrees with our measured area of 13,700 km², to within 2%.
Wikidata's official figure of 13,600 km² agrees with our measured area of 13,500 km², to within 2%.

Similar in size to Nagano

Similar in size to Trentino-Alto Adige

More comparisons

Sources and method

Outlines: Natural Earth, 1:10m Admin 1 - States, Provinces, public domain. The outline of Trentino-Alto Adige is the provinces Natural Earth draws there, joined along their shared borders.
Boundary: De facto, as drawn by Natural Earth. A region is drawn whole, every island included; a country is its main territory.
Area: Measured on the WGS84 ellipsoid from the full-detail outlines, shown rounded.
Drawing: Each outline is projected with an equal-area projection centred on its own centroid, so areas stay true and the two can be laid over each other.
Data built: 2026-11-12

Full method